Propellerhead Reason - 1.0.1 Betriebshandbuch PDF herunterladen (Seite 167)

THE EFFECT DEVICES

165

PH-90 Phaser

The PH-90 Phaser is a classic phaser effect with some special features for

fine-tuning the sound. It can create the classic sweeping phaser sounds suit-

able for pads or guitars, but also more extreme effects if you like. The phaser

is best used as an insert effect.

Theory

A phaser works by shifting portions of the audio signal out of phase, and then

adding the processed signal back to the original one. This way, narrow

bands of the frequency range (“notches”) are filtered out. When these fre-

quencies are adjusted, a sweeping phaser sound is created.

The PH-90 is a four-stage phaser, which means that there are four “notches”

in the frequency response curve (this is a little like using four notch filters with

different filter frequencies - see page 108 for an explanation of notch filters).

When the phaser frequency is adjusted (manually or by the built-in LFO),

these notches will move in parallel in the frequency spectrum. Furthermore,

you can adjust the distance between the notches (Split) and their Width.

Adding feedback raises the filter gain just below each notch in the frequency

range, creating a more pronounced effect.

Parameters

CV Inputs

The following CV inputs are available on the back panel of the device:

➜ Freq CV.

Adjusts the frequency parameter. Use this e.g. for creating envelope con-

trolled phasing (preferably with LFO Freq. Mod turned off in the device).

➜ Rate CV.

Lets you control the speed of the modulating LFO from another device.

About Stereo and Mono connections

The CF-101 can be connected using mono or stereo inputs, as shown by the

graphs on the back panel. Note the following:

➜ A “moving” stereo effect is only obtained when you use a mono in-

put and stereo outputs.

With a stereo input, the two sides are processed in parallel, maintaining

the stereo image of the original sound.

➜ When you are using a mono input and stereo outputs, there will

only be a stereo effect if the internal LFO is used.

If you turn LFO Mod Amount to zero, both stereo outputs will carry the

same signal (mono). This is because the “fake stereo” effect is produced

by inverting the modulation for one of the output channels.

Parameter

Description

Frequency Sets the frequency of the first notch. Adjusting this will move

the other notches correspondingly. This is the parameter

modulated by the LFO to create phaser sweeps.

Split This adjusts the distance between the notches in the fre-

quency range, thereby changing the character of the effect.

Width Determines the width of the notches. Raising the Width

deepens the effect and simultaneously makes the sound

more hollow and thin. This will also have an effect on char-

acter of the feedback “tone”.

LFO Rate This is the speed of the LFO modulating the frequency pa-

rameter. The higher the value, the faster the phaser sweeps.

LFO Freq.

Mod

This determines the depth of the LFO modulation, i.e. by

how much the frequency parameter should be modulated.

If you turn this to zero, the effect will be a static, formant-like

sound (most effective if you add a little feedback).

Feedback This is similar to the resonance control on a filter. Raising

the feedback gives a more pronounced “tone” in the effect.

For “singing” phaser sounds, try raising this to the maximum.

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